'inspiring day' is correct and usable in written English.
You could use it to describe feeling inspired by a particular day. For example, "Today was an inspiring day, filled with hope and opportunity."
jmgcomps2 An inspiring day for a writer: Stay at Immagineazione B&B, an inspirational budget B&B owned by two photographers (doubles from €49).
One inspiring day last Wednesday turned into a second and a third victory for the Yankees.
It's like going to see a band you've never heard of @ Glastonbury! @5aik Astonishingly inspiring day @GdnOpenWeekend.
The idea is this: teens from across America come together for one inspiring day of creating connections and overcoming problems like loneliness.
Go buy a ticket and join your people for one incredible, inspiring day.
President Obama has repeatedly promoted expanded school time, even inspiring "Saturday Night Live" to poke fun, with Seth Meyers saying in his Weekend Update segment that only "Catherine, the fifth grader nobody likes," would support such a proposal.
The Argentine won the praise of his players for inspiring Saturday's second-half comeback against the Gunners - so with the pressure on in the race for fourth, how will the players respond without their manager in the coming weeks?
"The web has immense power – I find something remarkable and inspiring every day but I agree with Sir Tim that we need to talk about the web we want," she said.
Valenti hopes the program will end up inspiring similar day programs for homeless people.
Anyway, this series was surprisingly popular here, inspiring solid Saturday Night Live and Onion parodies.
